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Amāha, nestled in the fertile plains of Bihar, India, occupies a geographically significant position within the Gangetic Basin. Located at approximately 26.1284° N, 86.7998° E, the city’s terrain is predominantly flat, characteristic of the Indo-Gangetic Plain, with an elevation of roughly 58 meters above sea level. This low-lying topography contributes to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. The surrounding landscape is dominated by agricultural fields – primarily rice and maize cultivation – which, while vital to the regional economy, can contribute to particulate matter through seasonal burning practices. Amāha’s proximity to the Ganges River, though providing a crucial water source, also influences local weather patterns, occasionally leading to humidity and fog, which can trap pollutants close to the ground. The urban–rural gradient around Amāha is relatively gradual; the city blends seamlessly into the agricultural landscape, meaning that agricultural emissions readily impact air quality within the urban area. While not directly adjacent to major industrial belts, the city serves as a regional trading hub, with increased vehicular traffic contributing to localized pollution. The lack of significant natural barriers, combined with the flat terrain, limits the dispersion of pollutants, making Amāha susceptible to poor air quality episodes, especially during specific meteorological conditions. The region's climate, characterized by hot summers and a distinct monsoon season, further complicates the atmospheric dynamics affecting air quality.

Amāha’s air quality follows a distinct seasonal pattern dictated by the region’s monsoon climate. The pre-monsoon season (March-May) typically witnesses the poorest air quality. Rising temperatures and decreasing wind speeds create atmospheric stability, fostering temperature inversions that trap pollutants near the surface. Agricultural burning, a common practice to clear fields for the planting season, significantly elevates particulate matter concentrations during this period. The monsoon season (June-September) brings relief, with increased rainfall and stronger winds dispersing pollutants. However, heavy rainfall can also lead to increased humidity and occasional localized flooding, which can temporarily exacerbate air quality issues. The post-monsoon season (October-November) sees a gradual return to drier conditions, and a resurgence of agricultural burning, leading to another period of elevated pollution. Winter months (December-February) are often characterized by dense fog, particularly in the mornings, which severely restricts visibility and traps pollutants, creating stagnant air conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and post-monsoon seasons, limiting outdoor activities during peak pollution hours. During the foggy winter months, it’s advisable to wear masks and avoid strenuous outdoor exertion. The monsoon season generally offers the most favourable conditions for outdoor activity, although vigilance regarding potential flooding is still necessary. Understanding these seasonal variations is crucial for managing health risks associated with air pollution in Amāha.